path: root/v4.0/src/BIOS/MSIOCTL.INC

	%OUT MSIOCTL.SIL...
	INCLUDE IOCTL.INC
;	$SALUT $ioctl$

;==============================================================================
;REVISION HISTORY:
;AN000 - New for DOS Version 4.00 - J.K.
;AC000 - Changed for DOS Version 4.00 - J.K.
;AN00x - PTM number for DOS Version 4.00 - J.K.
;==============================================================================
;AN001 - P58 Diskcopy format fails when error occurs during format op.6/26/87 J.K.
;AN002; - d24  MultiTrack= command added.			   6/29/87 J.K.
;AN003; - p155 Format intermittant failre due to haed settle time  8/18/87 J.K.
;AN004; D113 Disable I/O access to unformatted media		    9/03/87 J.K.
;AN005; P985 Allow I/O access to unformtted media		    9/14/87 J.K.
;AN006; D241 Provide support of Multi-track Format/Verify	    9/23/87 J.K.
;AN007; P1535 Unformatted hard file problem			   10/15/87 J.K.
;AN008; P2590 Change the recommended BPB info. after AFS format    11/20/87 J.K.
;AN009; P2828 Do not retry for multi-track format request	   12/08/87 J.K.
;AN010; P2781 Changeline error behavior incompatibile with DOS 3.3. 1/06/88 J.K.
;AN011; P3178 Set Media ID should update media info in BDS table.   1/21/88 J.K.
;AN012; D490 IOCTL subfunction 63h,43h,64h,44h conflicts with OS2   2/26/88 J.K.
;==============================================================================

;J.K. 10/15/87
;NOTE: GetAccessFlag/SetAccessFlag is unpublished function.
;      This function is intended to give the user to control the
;      BDS table FLAGS of UNFORMATTED_MEDIA bit.
;      GetAccessFlag will show the status -
;	 A_DISKACCESS_CONTROL.DAC_ACCESS_FLAG = 0 DISK I/O not allowed
;						1 DISK I/O allowed
;      SetAccessFlag will Set/Reset the UNFORMATTED_MEDIA bit in FLAGS -
;	 A_DISKACCESS_CONTROL.DAC_ACCESS_FLAG = 0 Allow disk I/O
;						1 Disallow disk I/O
;------------------------------------------------------------------------------

; GENERIC IOCTL DISPATCH TABLES
;
IOREADJUMPTABLE DB	7			;AN012;maximum number (0 based)
		DW	OFFSET GETDEVICEPARAMETERS		;60h
		DW	OFFSET READTRACK			;61h
		DW	OFFSET VERIFYTRACK			;62h
		dw	Cmd_Err_Proc				;AN012;Overlapped with OS2 subfunction
		dw	Cmd_Err_Proc				;AN012;
		dw	Cmd_Err_Proc				;AN012;
		dw	GetMediaID				;AN000;AN012;66h
		dw	GetAccessFlag				;AN007;AN012;67h Unpublished function

IOWRITEJUMPTABLE DB	7					;AN012;
		DW	OFFSET SETDEVICEPARAMETERS		;40h
		DW	OFFSET WRITETRACK			;41h
		DW	OFFSET FORMATTRACK			;42h
		dw	Cmd_Err_Proc				;AN012;
		dw	Cmd_Err_Proc				;AN012;
		dw	Cmd_Err_Proc				;AN012;
		dw	SetMediaID				;AN000;AN012;46h
		dw	SetAccessFlag				;AN007;AN012;47h Unpublished function
;
; TRACKTABLE CONTAINS A 4-TUPLES (C,H,R,N) FOR EACH SECTOR IN A TRACK
; C = CYLINDER NUMBER, H = HEAD NUMBER, R = SECTOR ID, N = BYTES PER SECTOR
;	N	BYTES PER SECTOR
;      ---	----------------
;	0	      128
;	1	      256
;	2	      512
;	3	     1024
;
MAX_SECTORS_CURR_SUP	EQU	63	; CURRENT MAXIMUM SEC/TRK THAT
					; WE SUPPORT (Was 40 in DOS 3.2)
SECTORSPERTRACK DW	36
TRACKTABLE	DB	0,0,1,2
		DB	0,0,2,2
		DB	0,0,3,2
		DB	0,0,4,2
		DB	0,0,5,2
		DB	0,0,6,2
		DB	0,0,7,2
		DB	0,0,8,2
		DB	0,0,9,2
		DB	0,0,10,2
		DB	0,0,11,2
		DB	0,0,12,2
		DB	0,0,13,2
		DB	0,0,14,2
		DB	0,0,15,2
		db	0,0,16,2
		db	0,0,17,2
		db	0,0,18,2
		db	0,0,19,2
		db	0,0,20,2
		db	0,0,21,2
		db	0,0,22,2
		db	0,0,23,2
		db	0,0,24,2
		db	0,0,25,2
		db	0,0,26,2
		db	0,0,27,2
		db	0,0,28,2
		db	0,0,29,2
		db	0,0,30,2
		db	0,0,31,2
		db	0,0,32,2
		db	0,0,33,2
		db	0,0,34,2
		db	0,0,35,2
		db	0,0,36,2
		DB	4*MAX_SECTORS_CURR_SUP - ($ - TRACKTABLE) DUP (0)

; THIS IS A REAL UGLY PLACE TO PUT THIS
; IT SHOULD REALLY GO IN THE BDS
MEDIATYPE	DB	0

MEDIA_SET_FOR_FORMAT	DB	0	; 1 IF WE HAVE DONE AN INT 13 SET MEDIA
					; TYPE FOR FORMAT CALL
Had_Format_Error	db	0	; 1 if the previous format operation
					; failed. - J.K. 7/8/86
Dsk_time_out_Err	equ	80h	; Time out error (No media present).
Dsk_change_line_Err	equ	6h	; Change line error
Dsk_illegal_combination equ	0Ch	; Return code of ah=18h function.

; TEMP DISK BASE TABLE. IT HOLDS THE THE CURRENT DPT WHICH IS THEN REPLACED BY
; THE ONE PASSED BY "NEW ROMS" BEFORE WE PERFORM A FORMAT OPERATION. THE OLD
; DPT IS RESTORED IN RESTOREOLDDPT. THE FIRST ENTRY (DISK_SPECIFY_1) IS -1 IF
; THIS TABLE DOES NOT CONTAIN THE PREVIOUSLY SAVED DPT.
TEMPDPT 	DD	-1

;
; GENERIC$IOCTL:
;    PERFORM GENERIC IOCTL REQUEST
;    INPUT:
;	AL	- UNIT NUMBER
;    OUTPUT:
;	IF CARRY SET THEN AL CONTAINS ERROR CODE
;
	PUBLIC GENERIC$IOCTL
GENERIC$IOCTL:
	MESSAGE FTESTDISK,<"GENERIC IOCTL",CR,LF>
	LES	BX,CS:[PTRSAV]		; ES:BX POINTS TO REQUEST HEADER.
	CALL	SETDRIVE		; DS:DI POINTS TO BDS FOR DRIVE.
;
; AT THIS POINT:
;    ES:BX - POINTS TO THE REQUEST HEADER
;    DS:DI POINTS TO THE BDS FOR THE DRIVE
;
	CMP	ES:[BX].MAJORFUNCTION, RAWIO
	JNE	IOCTL_FUNC_ERR
	MOV	AL, ES:[BX].MINORFUNCTION
	MOV	SI, OFFSET IOREADJUMPTABLE
	TEST	AL, GEN_IOCTL_FN_TST			; TEST OF REQ. FUNCTION
	JNZ	NOTGENERICIOCTLWRITE			;   FUNCTION IS A READ.
	MOV	SI, OFFSET IOWRITEJUMPTABLE
NOTGENERICIOCTLWRITE:
;	 AND	 AL, 0FH
	and	al, 9fH 			;AN000; Try to check other than 6x, 4x.
	CMP	AL, CS:[SI]
	JA	IOCTL_FUNC_ERR
	CBW
	SHL	AX, 1
	INC	SI
	ADD	SI,AX
	LES	BX, ES:[BX].GENERICIOCTL_PACKET
	CALL	CS:[SI]
	JC	FAILGENERIC$IOCTL
	JMP	EXIT

FAILGENERIC$IOCTL:
	JMP	ERR$EXIT

IOCTL_FUNC_ERR:
	JMP	CMDERR
Cmd_Err_Proc:					;AN012;
	pop	dx				;AN012;clear up stack
	pop	dx				;AN012;clear up stack
	jmp	IOCTL_FUNC_ERR			;AN012;Cmd error
;
; GETDEVICEPARAMETERS:
;
; INPUT: DS:DI POINTS TO BDS FOR DRIVE
;	 ES:BX POINTS TO DEVICE PARAMETER PACKET
;
	 PUBLIC GETDEVICEPARAMETERS
GETDEVICEPARAMETERS PROC NEAR
; COPY INFO FROM BDS TO THE DEVICE PARAMETERS PACKET
	MOV	AL, BYTE PTR DS:[DI].FORMFACTOR
	MOV	BYTE PTR ES:[BX].DP_DEVICETYPE, AL
	MOV	AX, WORD PTR DS:[DI].FLAGS
	AND	AX,FNON_REMOVABLE+FCHANGELINE	; MASK OFF OTHER BITS
	MOV	WORD PTR ES:[BX].DP_DEVICEATTRIBUTES, AX
	MOV	AX, WORD PTR DS:[DI].CCYLN
	MOV	WORD PTR ES:[BX].DP_CYLINDERS, AX

; SET MEDIA TYPE TO DEFAULT
	XOR	AL, AL
	MOV	BYTE PTR ES:[BX].DP_MEDIATYPE, AL

; COPY RECOMMENDED BPB
	LEA	SI, BYTE PTR [DI].RBYTEPERSEC
	TEST	BYTE PTR ES:[BX].DP_SPECIALFUNCTIONS, BUILD_DEVICE_BPB
	JZ	USE_BPB_PRESENT
; GET THE CORRECT DISK IN THE DRIVE
	CALL	CHECKSINGLE
; BUILD THE BPB FROM SCRATCH
	CALL	GETBP
	JC	GET_PARM_RET
	LEA	SI,BYTE PTR [DI].BYTEPERSEC
USE_BPB_PRESENT:
	LEA	DI, BYTE PTR [BX].DP_BPB
	MOV	CX, SIZE BPB_TYPE		; FOR NOW USE 'SMALL' BPB
	REP	MOVSB
	CLC
GET_PARM_RET:
	RET
GETDEVICEPARAMETERS ENDP

;
; SETDEVICEPARAMETERS:
;
; INPUT: DS:DI POINTS TO BDS FOR DRIVE
;	 ES:BX POINTS TO DEVICE PARAMETER PACKET
;
	 PUBLIC SETDEVICEPARAMETERS
SETDEVICEPARAMETERS PROC NEAR
; MAKE SURE THE FCHANGED_BY_FORMAT FLAG GETS SET TO KICK DOS INTO LOOKING AT
; THE BPB
	OR	WORD PTR DS:[DI].FLAGS, FCHANGED_BY_FORMAT OR FCHANGED
	TEST	BYTE PTR ES:[BX].DP_SPECIALFUNCTIONS, ONLY_SET_TRACKLAYOUT
	JZ	SHORT SETDEVPARM_1
	JMP	SETTRACKTABLE			; ORIGINALLY TRACKLAYOUT

SETDEVPARM_1:
; COPY INFO FROM THE DEVICE PARAMETERS PACKET TO BDS
	MOV	AL, BYTE PTR ES:[BX].DP_DEVICETYPE
	MOV	BYTE PTR DS:[DI].FORMFACTOR, AL

	MOV	AX, WORD PTR ES:[BX].DP_CYLINDERS
	MOV	WORD PTR DS:[DI].CCYLN, AX

; IF CHANGE LINE IS NOT LOADED THEN IGNORE CHANGELING FLAG
	MOV	AX, WORD PTR ES:[BX].DP_DEVICEATTRIBUTES
	CMP	CS:[FHAVE96],0
	JNZ	HAVE_CHANGE
	AND	AX,NOT FCHANGELINE
HAVE_CHANGE:
; IGNORE ALL BITS EXCEPT NON_REMOVABLE AND CHANGELINE
	AND	AX,FNON_REMOVABLE OR FCHANGELINE
	MOV	CX, WORD PTR DS:[DI].FLAGS
;	 AND	 CX, NOT (FNON_REMOVABLE OR FCHANGELINE OR GOOD_TRACKLAYOUT)
	AND	CX, NOT (FNON_REMOVABLE OR FCHANGELINE OR GOOD_TRACKLAYOUT or UNFORMATTED_MEDIA) ;AN004;AN005;AN007;
	OR	AX, CX
	MOV	WORD PTR DS:[DI].FLAGS, AX

; SET MEDIA TYPE
	MOV	AL, BYTE PTR ES:[BX].DP_MEDIATYPE
	MOV	CS:MEDIATYPE, AL
; THE MEDIA CHANGED (MAYBE) SO WE WILL HAVE TO DO A SETDASD THE NEXT TIME
; WE FORMAT A TRACK
	OR	WORD PTR DS:[DI].FLAGS, SET_DASD_TRUE

	SAVEREG <DS,DI,ES,BX>
; FIGURE OUT WHAT WE ARE SUPPOSED TO DO WITH THE BPB

; WERE WE ASKED TO INSTALL A FAKE BPB?
	TEST	BYTE PTR ES:[BX].DP_SPECIALFUNCTIONS, INSTALL_FAKE_BPB
	JNZ	SHORT INSTALLFAKEBPB

; WERE WE RETURNING A FAKE BPB WHEN ASKED TO BUILD A BPB?
	TEST	WORD PTR DS:[DI].FLAGS, RETURN_FAKE_BPB
	JZ	SHORT INSTALLRECOMMENDEDBPB

; WE WERE RETURNING A FAKE BPB BUT WE CAN STOP NOW
	AND	WORD PTR DS:[DI].FLAGS, NOT RETURN_FAKE_BPB
;	 JMP	 DONEWITHBPBSTUFF		;AN008; Comment out this instruction.

INSTALLRECOMMENDEDBPB:
	MOV	CX, SIZE A_BPB
	LEA	DI, BYTE PTR [DI].RBYTEPERSEC
	JMP	SHORT COPYTHEBPB

INSTALLFAKEBPB:
	or	word ptr ds:[di].flags, return_fake_bpb ;AN000; Problem
							;reported by WHS.
	MOV	CX, SIZE BPB_TYPE    ; MOVE 'SMALLER' BPB
	LEA	DI, BYTE PTR [DI].BYTEPERSEC
COPYTHEBPB:
	LEA	SI, BYTE PTR [BX].DP_BPB
; EXCHANGE ES AND DS
	PUSH	ES
	PUSH	DS
	POP	ES
	POP	DS

	REP	MOVSB

DONEWITHBPBSTUFF:
	CALL	RESTOREOLDDPT		; RESTORE THE OLD DPT FROM TEMPDPT
	RESTOREREG <BX,ES,DI,DS>

; SET UP TRACK TABLE (IF NECCESSARY)
SETTRACKTABLE:
	MOV	CX, WORD PTR ES:[BX].DP_TRACKTABLEENTRIES
	MOV	CS:SECTORSPERTRACK, CX
	AND	WORD PTR DS:[DI].FLAGS, NOT GOOD_TRACKLAYOUT
	TEST	BYTE PTR ES:[BX].DP_SPECIALFUNCTIONS, TRACKLAYOUT_IS_GOOD
	JZ	UGLYTRACKLAYOUT
	OR	WORD PTR DS:[DI].FLAGS, GOOD_TRACKLAYOUT

UGLYTRACKLAYOUT:
	CMP	CX, MAX_SECTORS_IN_TRACK
	JA	TOOMANYSECTORSPERTRACK
	JCXZ	SECTORINFOSAVED
	MOV	DI, OFFSET TRACKTABLE
	LEA	SI, ES:[BX].DP_SECTORTABLE
	PUSH	ES
	POP	DS
	PUSH	CS
	POP	ES
STORESECTORINFO:
	INC	DI				; SKIP OVER CYLINDER
	INC	DI				; SKIP OVER HEAD
	LODSW					; GET SECTOR ID
	PUSH	AX				; SAVE IT
	LODSW					; GET SECTOR SIZE
	CALL	SECTORSIZETOSECTORINDEX
	POP	DX				; GET SECTOR ID BACK
	MOV	AL, DL				; AH = SECTOR SIZE INDEX
						; AL = SECTOR ID
	STOSW
	LOOP	STORESECTORINFO

SECTORINFOSAVED:
	CLC
	RET

TOOMANYSECTORSPERTRACK:
	MOV	AL, 0CH
	STC
	RET

SETDEVICEPARAMETERS ENDP

;
; SET MEDIA TYPE FOR FORMAT
; PERFORMS THE INT 13 WITH AH = 18H TO SEE IF THE MEDIUM DESCRIBED IN THE
; BPB AREA IN THE BDS CAN BE HANDLED BY THE ROM.
; ON INPUT, DS:DI -> CURRENT BDS.
; THE STATUS OF THE OPERATION IS RETURNED IN AL
;	- 0 - IF THE SUPPORT IS AVAILABLE, AND THE COMBINATION IS VALID.
;	- 1 - NO ROM SUPPORT
;	- 2 - ILLEGAL COMBINATION
;	- 3 - No media present (ROM support exists but cannot determine now)
; FLAGS ALSO MAY BE ALTERED. ALL OTHER REGISTERS PRESERVED.
; IF THE CALL TO ROM RETURNS NO ERROR, THEN THE CURRENT DPT IS "REPLACED" BY
; THE ONE RETURNED BY THE ROM. THIS IS DONE BY CHANGING THE POINTER IN [DPT]
; TO THE ONE RETURNED. THE ORIGINAL POINTER TO THE DISK BASE TABLE IS STORED
; IN TEMPDPT, UNTIL IT IS RESTORED.
;
	PUBLIC SET_MEDIA_FOR_FORMAT
SET_MEDIA_FOR_FORMAT PROC NEAR
	SAVEREG <CX,DX>
	XOR	AX,AX
	cmp	cs:[Had_Format_Error],1 ;Did we have a format error before?
	jne	No_Form_Err		;AN001;
	call	ResetDisk
No_Form_Err:				;AN001;
	CMP	BYTE PTR CS:[MEDIA_SET_FOR_FORMAT],1
	jnz	Do_Set_Media_for_Format
	jmp	SET_MED_RET		; MEDIA ALREADY SET
Do_Set_Media_for_Format:
	SAVEREG <DS,SI>
	MOV	DS,AX
	LDS	SI,DWORD PTR DS:[DSKADR]	; GET POINTER TO DISK BASE TABLE
	MOV	WORD PTR CS:[DPT],SI
	MOV	WORD PTR CS:[DPT+2],DS		; SAVE POINTER TO TABLE
;SB34IOCTL000******************************************************************
;SB	Initialise the head settle time to 0fh.  See the offsets given in
;SB	DSKPRM.INC.  1 LOC.

	mov	ds:[si].DISK_HEAD_STTL, 0Fh
;SB34IOCTL000******************************************************************
	RESTOREREG <SI,DS>
	mov	cs:[New_Rom], 1 	;assume a new ROM.
	XOR	AL,AL
;SB33031****************************************************************
	mov	cx,ds:[di.ccyln]	;get number of cylinders     ;SB  ;3.30*
	dec	cx			;cylinder must be zero based ;SB  ;3.30*
	and	ch,03h			; blank out unnecessary bits
	ror	ch,1			;put in int form	     ;SB  ;3.30*
	ror	ch,1			;			     ;SB  ;3.30*
	xchg	ch,cl			;			     ;SB  ;3.30*
	or	cl,byte ptr ds:[di.seclim] ;get number of sectors    ;SB  ;3.30*
	mov	dl,ds:[di.drivenum]	;get drive number	     ;SB  ;3.30*
	mov	ah,18h			;set media for format	     ;SB  ;3.30*
	SAVEREG <ES,DS,SI,DI>
	int	13h			;call rom bios		     ;SB  ;3.30*
;SB33031****************************************************************
	JC	FORMAT_STAT_ERR
; ES:DI POINTS TO A DISK BASE TABLE FOR THIS COMBINATION FOR THIS DRIVE.
	XOR	CX,CX
	MOV	DS,CX				; HAVE DS -> SEGMENT 0
	LDS	SI,DWORD PTR DS:[DSKADR]	; GET CURRENT DISK BASE TABLE
	MOV	WORD PTR CS:[TEMPDPT],SI
	MOV	WORD PTR CS:[TEMPDPT+2],DS	; SAVE IT
	MOV	WORD PTR DS:[DSKADR],DI
	MOV	WORD PTR DS:[DSKADR+2],ES	; REPLACE WITH ONE RETURNED BY ROM
	MOV	BYTE PTR CS:[MEDIA_SET_FOR_FORMAT],1
Skip_Disk_Base_setting:
	XOR	AL,AL			; LEGAL COMBINATION + ROM SUPPORT CODE
	mov	cs:[Had_Format_Error],al ;reset the flag
	JMP	SHORT POP_STAT_RET

FORMAT_STAT_ERR:
	cmp	ah, Dsk_illegal_combination	;J.K. illegal combination = 0ch
	je	Format_stat_illegal_comb
	cmp	ah, Dsk_Time_Out_Err		;J.K. = 80h
	je	Format_stat_Time_out
	mov	al, 1				;Function not supported.
	mov	cs:[New_Rom], 0 		;So, it is an old rom.
	jmp	short Pop_stat_ret
Format_stat_illegal_comb:			;J.K. Function supported, but
	MOV	AL,2				;J.K. illegal sect/trk, trk combination.
	jmp	short Pop_stat_ret
Format_stat_Time_out:				;J.K. Function supported, but
	mov	al, 3				;J.K. media not present.
POP_STAT_RET:
	RESTOREREG <DI,SI,DS,ES>
SET_MED_RET:
	RESTOREREG <DX,CX>
	RET

SET_MEDIA_FOR_FORMAT ENDP

;
; FORMATTRACK:
; IF SPECIALFUNCTION BYTE IS 1, THEN THIS IS A STATUS CALL TO SEE IF THERE IS
; ROM SUPPORT FOR THE COMBINATION OF SEC/TRK AND # OF CYLN, AND IF THE
; COMBINATION IS LEGAL. IF SPECIALFUNCTION BYTE IS 0, THEN FORMAT THE TRACK.
;
; INPUT: DS:DI POINTS TO BDS FOR DRIVE
;	 ES:BX POINTS TO FORMAT PACKET
;
; OUTPUT:
;	FOR STATUS CALL:
;	SPECIALFUNCTION BYTE SET TO:
;		0 - ROM SUPPORT + LEGAL COMBINATION
;		1 - NO ROM SUPPORT
;		2 - ILLEGAL COMBINATION
;		3 - no media present	;J.K. 7/8/86
;	CARRY CLEARED.
;
;	FOR FORMAT TRACK:
;		CARRY SET IF ERROR
;
	PUBLIC FORMATTRACK
FORMATTRACK PROC NEAR
	TEST	BYTE PTR ES:[BX].DP_SPECIALFUNCTIONS,STATUS_FOR_FORMAT
	JZ	DO_FORMAT_TRACK
	CALL	SET_MEDIA_FOR_FORMAT	; ALSO MOVES CURRENT DPT TO TEMPDPT
STAT_RET:
	MOV	BYTE PTR ES:[BX].DP_SPECIALFUNCTIONS,AL
	CLC
	RET

DO_FORMAT_TRACK:
	CMP	BYTE PTR DS:[DI].FORMFACTOR, DEV_HARDDISK
	jne	Do_Format_Diskette
	jmp	DoVerifyTrack
Do_Format_Diskette:
	SAVEREG <DS,DI,ES,BX>
;SB34IOCTL001*************************************************************
;SB	check the special functions word to see if DO_FAST_FORMAT has been
;SB	specified.  If so it is an error and we need to finish this operation
;SB	by indicating the error value 1 in register ah and going to the
;SB	the code at DO_MAP_IT to map the error.  This is because we cannot
;SB	allow multitrack format on floppies - 5 LOCS

	test	byte ptr es:[bx].FP_SPECIALFUNCTIONS,DO_FAST_FORMAT
	jz	NO_FAST_FORMAT
	mov	ah, 1
	jmp	DO_MAP_IT
NO_FAST_FORMAT:
;SB34IOCTL001*************************************************************
	CALL	SET_MEDIA_FOR_FORMAT	; ALSO MOVES CURRENT DPT TO TEMPDPT
	CMP	AL,1		; DO WE HAVE ROM SUPPORT FOR sector/trk, # trks combination?
	JZ	Need_Set_DASD	;Old ROM.
	cmp	al,3		;time out error?
	jnz	No_Set_DASD	;No, fine.(At this point, don't care about the illegal combination.)
	jmp	Format_Failed
Need_Set_DASD:
	CALL	SETDASD 	;AH=17h, INT 13h
;
; STORE CYLINDER,HEAD IN TRACK TABLE
;			***** ASSUMPTION *******
;	SINCE FORMAT REQUESTS ON FIXED MEDIA ARE CONVERTED TO VERIFIES, WE
;	ASSUME THAT WE ARE FORMATTING A FLOPPY AND HENCE HAVE 255 OR LESS
;	TRACKS AND HEADS. WE THEREFORE MUST CHANGE THE CYLINDER, HEAD DATA
;	FROM THE REQUEST PACKET SIZE TO THAT OF THE TRACKTABLE (SEE INT 13
;	INTERFACE IN IBM'S TECH REF.).

NO_SET_DASD:
; CHECK TO ENSURE CORRECT DISK IS IN DRIVE
	CALL	CHECKSINGLE

	MOV	AX, WORD PTR ES:[BX].FP_CYLINDER
	MOV	WORD PTR CS:[TRKNUM],AX
	MOV	CX, WORD PTR ES:[BX].FP_HEAD
	MOV	BYTE PTR CS:[HDNUM],CL
	MOV	AH,CL

	PUSH	DI					; SAVE PTR TO BDS
	MOV	DI, OFFSET TRACKTABLE
	PUSH	CS
	POP	ES
	MOV	CX, CS:SECTORSPERTRACK
STORECYLINDERHEAD:
	STOSW
	INC	DI					; SKIP SECTOR ID
	INC	DI					; SKIP SECTOR SIZE
	LOOP	STORECYLINDERHEAD
	POP	DI					; RESTORE PTR TO BDS

	MOV	CX, MAXERR			; SET UP RETRY COUNT
FORMATRETRY:
	PUSH	CX
	MOV	BX, OFFSET TRACKTABLE
	PUSH	CS
	POP	ES
	MOV	AX, CS:SECTORSPERTRACK
	MOV	AH, ROMFORMAT
	CALL	TO_ROM
	POP	CX
	JNC	FORMATOK
	call	resetdisk
	mov	cs:[Had_Format_Error],1
	push	ax
	push	cx
	push	dx
	call	Set_Media_For_Format
	cmp	al, 1
	jnz	While_Err
	call	SetDASD
While_Err:
	pop	dx
	pop	cx
	pop	ax
	LOOP	FORMATRETRY
;SB33106*******************************************************************
Format_Failed:
	mov	cs:[Had_Format_Error], 1	;set the format error flag.
	cmp	ah, Dsk_Change_Line_Err 	;=06h. Convert change line
	jne	Do_Map_it			;error to Time Out error.
	mov	ah, Dsk_Time_Out_Err		;=80h
;SB33106*******************************************************************
Do_Map_it:
	CALL	MAPERROR
	RESTOREREG <BX,ES,DI,DS>
	RET

FORMATOK:
	mov	cs:[Had_Format_Error],0 	;reset the format error flag.
	RESTOREREG <BX,ES,DI,DS>

DOVERIFYTRACK:
	CALL	VERIFYTRACK
	RET

FORMATTRACK ENDP

VerifyTrack_Err:				;AN006;
	mov	ah, 1				;AN006;
	call	MapError			;AN006;
	ret					;AN006;

;
; VERIFYTRACK:
;
; INPUT: DS:DI POINTS TO BDS FOR DRIVE
;	 ES:BX POINTS TO VERIFY PACKET
;
	PUBLIC VERIFYTRACK
VERIFYTRACK PROC NEAR
	MOV	CS:RFLAG, ROMVERIFY
	MOV	AX, WORD PTR ES:[BX].VP_CYLINDER
	MOV	CS:CURTRK, AX
	MOV	AX, WORD PTR ES:[BX].VP_HEAD

;	****** ASSUMPTION ******
;	WE ASSUME THAT WE HAVE LESS THAN 256 HEADS, AND THAT THE REQUEST
;	HEADER DATA STRUCTURE IS UNNECCESSARILY BIG
	MOV	CS:CURHD, AL
	MOV	CX, CS:SECTORSPERTRACK		;CL = sectors/track
;SB34IOCTL005*************************************************************
;SB
;SB	Check SPECIALFUNCTIONS to see if DO_FAST_FORMAT has been specified
;SB	If not we should go to the normal track verification routine.  If
;SB	fast format has been specified we should get the number of tracks
;SB	to be verified and check it to see if it is > 255.  If it is then
;SB	it is an error and we should go to VerifyTrack_Err. If not multiply
;SB	the number of tracks by the sectors per track to get the total
;SB	number of sectors to be verified.  This should also be less than
;SB	equal to 255 otherwise we go to same error exit.  If everything
;SB	is okay we initalise cx to the total sectors. use ax as a temporary
;SB	register.  9 LOCS

	test	byte ptr es:[bx].FP_SPECIALFUNCTIONS,DO_FAST_FORMAT
	jz	Norm_VerifyTrack
	mov	ax,es:[bx].FP_TRACKCOUNT	;ax <- tracks to be verify
	cmp	ax,0FFh
	ja	VerifyTrack_Err 		;#tracks > 255
	mul	cl
	cmp	ax,0FFh 			;#sectors > 255
	ja	VerifyTrack_Err
	mov	cx,ax				;#sectors to verify
;SB34IOCTL005*************************************************************

;Set the multi track request flag
	test	word ptr [di].Flags, fNON_REMOVABLE	;AN009;hard disk?
	jz	Norm_VerifyTrack			;AN009;
	test	cs:Multrk_Flag, MULTRK_ON		;AN009;MultiTrack operation = on?
	jz	Norm_VerifyTrack			;AN009;
	mov	cs:Multitrk_Format_Flag, 1		;AN009; then set the flag
Norm_VerifyTrack:				;AN006;
	XOR	AX, AX				;1st sector
; USE 0:0 AS THE TRANSFER ADDRESS FOR VERIFY
	XOR	BX, BX
	MOV	ES, BX
	CALL	TRACKIO
	mov	cs:Multitrk_Format_Flag, 0		;AN009;Reset the flag.
	RET
VERIFYTRACK ENDP

;
; READTRACK:
;
; INPUT: DS:DI POINTS TO BDS FOR DRIVE
;	 ES:BX POINTS TO READ PACKET
;
	PUBLIC READTRACK
READTRACK:
	MOV	CS:RFLAG, ROMREAD
	JMP	READWRITETRACK

;
; WRITETRACK:
;
; INPUT: DS:DI POINTS TO BDS FOR DRIVE
;	 ES:BX POINTS TO WRITE PACKET
;
	PUBLIC WRITETRACK
WRITETRACK:
	MOV	CS:RFLAG, ROMWRITE
	JMP	READWRITETRACK
;
; READWRITETRACK:
;
; INPUT:
;    DS:DI POINTS TO BDS FOR DRIVE
;    ES:BX POINTS TO WRITE PACKET
;    RFLAG - 2 FOR READ, 3 FOR WRITE
;
	PUBLIC READWRITETRACK
READWRITETRACK PROC NEAR
	MOV	AX, WORD PTR ES:[BX].TRWP_CYLINDER
	MOV	CS:CURTRK, AX
	MOV	AX, WORD PTR ES:[BX].TRWP_HEAD

;	****** ASSUMPTION ******
;	WE ASSUME THAT WE HAVE LESS THAN 256 HEADS, AND THAT THE REQUEST
;	HEADER DATA STRUCTURE IS UNNECCESSARILY BIG
	MOV	CS:CURHD, AL
	MOV	AX, WORD PTR ES:[BX].TRWP_FIRSTSECTOR
	MOV	CX, WORD PTR ES:[BX].TRWP_SECTORSTOREADWRITE
	LES	BX, ES:[BX].TRWP_TRANSFERADDRESS
	CALL	TRACKIO
	RET
READWRITETRACK ENDP


;
; TRACKIO:
;    PERFORMS TRACK READ/WRITE/VERIFY
;
;   INPUT:
;      RFLAG	- 2 = READ
;		  3 = WRITE
;		  4 = VERIFY
;      AX	- INDEX INTO TRACK TABLE OF FIRST SECTOR TO IO
;      CX	- NUMBER OF SECTORS TO IO
;      ES:BX	- TRANSFER ADDRESS
;      DS:DI	- POINTER TO BDS
;      CURTRK	- CURRENT CYLINDER
;      CURHD	- CURRENT HEAD
;
	PUBLIC TRACKIO
TRACKIO PROC NEAR
; PROCEDURE `DISK' WILL POP STACK TO SPSAV AND RETURN IF ERROR
	MOV	CS:SPSAV, SP
; ENSURE CORRECT DISK IS IN DRIVE
	CALL	CHECKSINGLE
; SEE IF WE HAVE ALREADY SET THE DISK BASE TABLE
	CMP	BYTE PTR CS:[MEDIA_SET_FOR_FORMAT],1
	JZ	DPTALREADYSET
;
; SET UP TABLES AND VARIABLES FOR I/O
;
	SAVEREG <AX,CX>
	CALL	IOSETUP
	RESTOREREG <CX,AX>
;
; POINT SI AT THE TABLE ENTRY OF THE FIRST SECTOR TO BE IO'D
;
DPTALREADYSET:
	MOV	SI, OFFSET TRACKTABLE
	SHL	AX, 1
	SHL	AX, 1
	ADD	SI, AX
;
; WE WANT:
;    CX TO BE THE NUMBER OF TIMES WE HAVE TO LOOP
;    DX TO BE THE NUMBER OF SECTORS WE READ ON EACH ITERATION
	MOV	DX, 1
	TEST	WORD PTR DS:[DI].FLAGS, GOOD_TRACKLAYOUT
	JZ	IONEXTSECTOR

; HEY! WE CAN READ ALL THE SECTORS IN ONE BLOW
	XCHG	DX, CX

IONEXTSECTOR:
	PUSH	CX
	PUSH	DX
; SKIP OVER THE CYLINDER AND HEAD IN THE TRACK TABLE
	INC	SI
	INC	SI
; GET SECTOR ID FROM TRACK TABLE
	LODS	BYTE PTR CS:[SI]
	MOV	CS:CURSEC, AL
;*** For a Fixed disk multi-track disk I/O - J.K. 4/14/86
;Assumptions: 1). In the input CX (# of sectors to go) to TRACKIO, only CL is
;valid.  2). Sector size should be set to 512 bytes. 3). GOODTRACKLAYOUT.
;
	test	word ptr [di].Flags, fNon_Removable	;Fixed disk? - J.K.
	jz	IOREMOVABLE				;no -J.K.
	test	cs:MulTrk_Flag, MULTRK_ON		;AN002; Allow multi-track operation?
	jz	IORemovable				;AN002; No, don't do that.
	mov	cs:[seccnt], dx 			;# of sectors to I/O -J.K.
	mov	ax, dx					;J.K.
	call	disk					;J.K.
	pop	dx					;J.K.
	pop	cx					;J.K.
	clc						;J.K.
	ret						;J.K.
IOREMOVABLE:						;J.K.
; GET SECTOR SIZE INDEX FROM TRACK TABLE AND SAVE IT
	LODS	BYTE PTR CS:[SI]
	PUSH	AX
; PATCH SECTOR SIZE IN DPT
	PUSH	SI
	PUSH	DS
	LDS	SI, CS:DPT
	MOV	BYTE PTR DS:[SI].DISK_SECTOR_SIZ,AL
	MOV	AL,CS:[EOT]
	MOV	[SI].DISK_EOT,AL	; SET UP THE MAX NUMBER OF SEC/TRACK
	POP	DS
	MOV	AL, DL
DOTHEIO:
	MOV	CS:[SECCNT],AX		; SET UP THE COUNT OF SECTORS TO I/O
	CALL	DISK
; ADVANCE BUFFER POINTER BY ADDING SECTOR SIZE
	POP	SI
	POP	AX
	CALL	SECTORSIZEINDEXTOSECTORSIZE
	ADD	BX, AX
	POP	DX
	POP	CX
	LOOP	IONEXTSECTOR
	cmp	byte ptr cs:[Media_Set_For_Format], 1	;AN001;
	je	No_Need_Done				;AN001;
	CALL	DONE			; SET TIME OF LAST ACCESS, AND RESET
No_Need_Done:				;AN001;
	CLC				; ENTRIES IN DPT.
	RET

TRACKIO ENDP
;
; THE SECTOR SIZE IN BYTES NEEDS TO BE CONVERTED TO AN INDEX VALUE FOR THE IBM
; ROM. (0=>128, 1=>256,2=>512,3=>1024). IT IS ASSUMED THAT ONLY THESE VALUES
; ARE PERMISSIBLE.
; ON INPUT   AX CONTAINS SECTOR SIZE IN BYTES
; ON OUTPUT  AL CONTAINS INDEX
;
	PUBLIC SECTORSIZETOSECTORINDEX
SECTORSIZETOSECTORINDEX PROC NEAR
	CMP	AH,2			; EXAMINE UPPER BYTE ONLY
	JA	ONEK
	MOV	AL,AH			; VALUE IN AH IS THE INDEX!
	RET
ONEK:
	MOV	AL,3
	RET
SECTORSIZETOSECTORINDEX ENDP

SECTORSIZEINDEXTOSECTORSIZE PROC NEAR
	MOV	CL, AL
	MOV	AX,128
	SHL	AX, CL
	RET
SECTORSIZEINDEXTOSECTORSIZE ENDP

;
; SET UP THE ROM FOR FORMATTING.
; WE HAVE TO TELL THE ROM BIOS WHAT TYPE OF DISK IS IN THE DRIVE.
; ON INPUT   - DS:DI - POINTS TO BDS
;
	PUBLIC SETDASD
SETDASD:
; SEE IF WE HAVE PREVIOUSLY SET DASD TYPE
;SB33114******************************************************************
	cmp	cs:[Had_Format_Error],1
	je	DoSetDasd
;SB33114******************************************************************
	TEST	WORD PTR DS:[DI].FLAGS, SET_DASD_TRUE
	JZ	DASDHASBEENSET
	AND	WORD PTR DS:[DI].FLAGS, NOT SET_DASD_TRUE
;SB33115******************************************************************
DoSetDasd:
	mov	cs:[Had_Format_Error],0 ;reset it
;SB33115******************************************************************
	MOV	CS:[GAP_PATCH],50H	; FORMAT GAP FOR 48TPI DISKS
	MOV	AL,4
	CMP	BYTE PTR DS:[DI].FORMFACTOR,DEV_3INCH720KB
	JZ	DO_SET
	CMP	BYTE PTR DS:[DI].FORMFACTOR, DEV_5INCH96TPI
	JZ	GOT_BIG
	MOV	AL,1			; 160/320K IN A 160/320K DRIVE
	JMP	SHORT DO_SET
GOT_BIG:
	MOV	AL,2			; 160/320K IN A 1.2 MEG DRIVE
	CMP	CS:MEDIATYPE, 0
	JNE	DO_SET
	MOV	AL,3			; 1.2MEG IN A 1.2MEG DRIVE
	MOV	CS:[GAP_PATCH],54H
DO_SET:
	push	ds				;AN003;
	push	si				;AN003;
;SB34IOCTL002****************************************************************
;SB	Get the disk parameter table address (dword address) from the location
;SB	0:[DSKADR] and fix the head settle time in this to be 0fh. 4 LOCS

	xor	si, si
	mov	ds, si
	lds	si, dword ptr ds:[DSKADR]
	mov	ds:[si].DISK_HEAD_STTL, 0Fh
;SB34IOCTL002****************************************************************
	pop	si				;AN003;
	pop	ds				;AN003;
;SB33032******************************************************************
	mov	AH, 17h 		; set command to Set DASD type;SB ;3.30*
	mov	DL, [di].DriveNum	; set drive number	      ;SB ;3.30*
	int	13h			; call rom-bios 	      ;SB ;3.30*
;SB33032******************************************************************
DASDHASBEENSET:
	MOV	AH,BYTE PTR [DI].SECLIM
	MOV	CS:[FORMT_EOT],AH
	RET

;
; THIS ROUTINE IS CALLED IF AN ERROR OCCURS WHILE FORMATTING OR VERIFYING.
; IT RESETS THE DRIVE, AND DECREMENTS THE RETRY COUNT.
; ON ENTRY - DS:DI - POINTS TO BDS FOR THE DRIVE
;	     BP    - CONTAINS RETRY COUNT
; ON EXIT    FLAGS INDICATE RESULT OF DECREMENTING RETRY COUNT
;
AGAIN:
	CALL	RESETDISK

;(deleted section here, as requested by D.L.)

	DEC	BP			; DECREMENT RETRY COUNT
	RET


; RESET THE DRIVE.
; WE ALSO SET [STEP_DRV] TO -1 TO FORCE THE MAIN DISK ROUTINE TO USE THE
; SLOW HEAD SETTLE TIME FOR THE NEXT OPERATION. THIS IS BECAUSE THE RESET
; OPERATION MOVES THE HEAD TO CYLINDER 0, SO WE NEED TO DO A SEEK THE NEXT
; TIME AROUND - THERE IS A PROBLEM WITH 3.5" DRIVES IN THAT THE HEAD DOES
; NOT SETTLE DOWN IN TIME, EVEN FOR READ OPERATIONS!!
;
	PUBLIC RESETDISK
RESETDISK:
	SAVEREG <AX>
;SB33033******************************************************************
	xor	AH, AH			; set command to reset disk   ;SB ;3.30*
	int	13h			; call the rom-bios	      ;SB ;3.30*
;SB33033******************************************************************
	MOV	CS:[STEP_DRV],-1	; ZAP UP THE SPEED
	RESTOREREG <AX>
	RET

;
; THIS ROUTINE SETS UP THE DRIVE PARAMETER TABLE WITH THE VALUES NEEDED FOR
; FORMAT, DOES AN INT 13. VALUES IN DPT ARE RESTORED AFTER A VERIFY IS DONE.
;
; ON ENTRY  -	DS:DI - POINTS TO BDS FOR THE DRIVE
;		ES:BX - POINTS TO TRKBUF
;		AL    - NUMBER OF SECTORS
;		AH    - INT 13 FUNCTION CODE
;		CL    - SECTOR NUMBER FOR VERIFY
; ON EXIT   -	DS,DI,ES,BX REMAIN UNCHANGED.
;		AX AND FLAGS ARE THE RESULTS OF THE INT 13
;
	PUBLIC TO_ROM
TO_ROM:
	SAVEREG <DS,DI,ES,BX,SI>
	TEST	BYTE PTR CS:[NEW_ROM],1
	JNZ	GOT_VALID_DPT
	PUSH	AX
	MOV	DX,DS			; SAVE DS:DI-> BDS
	XOR	AX,AX
	MOV	DS,AX
	LDS	SI,DWORD PTR DS:[DSKADR]	; GET POINTER TO DISK BASE TABLE
	MOV	WORD PTR CS:[DPT],SI
	MOV	WORD PTR CS:[DPT+2],DS		; SAVE POINTER TO TABLE
	MOV	AL,CS:[FORMT_EOT]
	MOV	[SI].DISK_EOT,AL
	MOV	AL,CS:[GAP_PATCH]
	MOV	[SI].DISK_FORMT_GAP,AL	; IMPORTANT FOR FORMAT
	MOV	[SI].DISK_HEAD_STTL,15	; ASSUME WE ARE DOING A SEEK OPERATION
; SET UP MOTOR START CORRECTLY FOR 3.5" DRIVES.
	PUSH	ES
	MOV	ES,DX
	CMP	BYTE PTR ES:[DI].FORMFACTOR,FFSMALL	; IS IT A 3.5" DRIVE?
	JNZ	MOTORSTRTOK
	MOV	AL,4
	XCHG	AL,[SI].DISK_MOTOR_STRT
MOTORSTRTOK:
	POP	ES
;----------------------------------------------------------------------------
; THE FOLLOWING TWO LINES ARE NO LONGER NECESSARY SINCE THEY ARE ONLY USEFUL
; FOR A VERIFY OPERATION.
;	MOV	AL,CS:[SECTOR_SIZ_IND]
;	MOV	[SI].DISK_SECTOR_SIZ,AL ; IMPORTANT FOR VERIFY
;----------------------------------------------------------------------------
	MOV	DS,DX			; RESTORE DS:DI-> BDS
	POP	AX
GOT_VALID_DPT:
;SB33034*******************************************************************
	mov	dx, cs:[trknum] 	; set track number	      ;SB ;3.30*
	mov	ch,dl			; set low 8 bits in ch	      ;SB ;3.30*
	mov	DL, ds:[di].DriveNum	; set drive number	      ;SB ;3.30*
	mov	DH, CS:[HDNUM]		; set head number	      ;SB ;3.30*
	int	13h			; call the rom-bios  routines ;SB ;3.30*
;SB33034*******************************************************************
	RESTOREREG <SI,BX,ES,DI,DS>
	RET

;
; GET THE OWNER OF THE PHYSICAL DRIVE REPRESENTED BY THE LOGICAL DRIVE IN BL.
; THE ASSUMPTION IS THAT WE **ALWAYS** KEEP TRACK OF THE OWNER OF A DRIVE!!
; IF THIS IS NOT THE CASE, THE SYSTEM MAY HANG, JUST FOLLOWING THE LINKED LIST.
;
	PUBLIC	IOCTL$GETOWN
IOCTL$GETOWN:
	CALL	SETDRIVE
	MOV	AL,BYTE PTR [DI].DRIVENUM	; GET PHYSICAL DRIVE NUMBER
	PUSH	CS
	POP	DS
	MOV	DI,WORD PTR START_BDS
OWN_LOOP:
	CMP	BYTE PTR [DI].DRIVENUM,AL
	JNE	GETNEXTBDS
	TEST	WORD PTR [DI].FLAGS,FI_OWN_PHYSICAL
	JNZ	DONE_GETOWN
GETNEXTBDS:
	MOV	BX,WORD PTR [DI].LINK+2
	MOV	DI,WORD PTR [DI].LINK
	MOV	DS,BX
	JMP	SHORT OWN_LOOP
DONE_GETOWN:
	JMP	SHORT EXIT_OWN

;
; SET THE OWNERSHIP OF THE PHYSICAL DRIVE REPRESENTED BY THE LOGICAL DRIVE IN
; BL TO BL.
;
	PUBLIC IOCTL$SETOWN
IOCTL$SETOWN:
	CALL	SETDRIVE
	MOV	BYTE PTR CS:[FSETOWNER],1	; SET FLAG FOR CHECKSINGLE TO
						; LOOK AT.
	CALL	CHECKSINGLE			; SET OWNERSHIP OF DRIVE
	MOV	BYTE PTR CS:[FSETOWNER],0	; RESET FLAG
	XOR	BX,BX
	MOV	ES,BX
	MOV	CL,-1
	MOV	BYTE PTR ES:[LSTDRV],CL 	; SET UP SDSB AS WELL

EXIT_OWN:
; IF THERE IS ONLY ONE LOGICAL DRIVE ASSIGNED TO THIS PHYSICAL DRIVE, RETURN
; 0 TO USER TO INDICATE THIS.
	XOR	CL,CL
	TEST	WORD PTR [DI].FLAGS,FI_AM_MULT
	JZ	EXIT_NO_MULT
	MOV	CL,BYTE PTR [DI].DRIVELET	; GET LOGICAL DRIVE NUMBER
	INC	CL				; GET IT 1-BASED
EXIT_NO_MULT:
	LDS	BX,CS:[PTRSAV]
	MOV	BYTE PTR [BX].UNIT,CL
	JMP	EXIT


;
; MOVES THE OLD DPT THAT HAD BEEN SAVED IN TEMPDPT BACK TO DPT. THIS IS DONE
; ONLY IF THE FIRST BYTE OF TEMPDPT IS NOT -1.
; ALL REGISTERS (INCLUDING FLAGS) ARE PRESERVED.
;
	PUBLIC RESTOREOLDDPT
RESTOREOLDDPT:
; IF WE HAVE ALREADY RESTORED THE DISK BASE TABLE EARLIER, DO NOT DO IT
; AGAIN.
	PUSH	AX
	XOR	AL,AL
; RESET FLAG AND GET CURRENT FLAG SETTING
	mov	cs:[Had_Format_Error],al
	XCHG	BYTE PTR CS:[MEDIA_SET_FOR_FORMAT],AL
	OR	AL,AL
	JZ	DONTRESTORE
	SAVEREG <SI,DS,ES>
	LDS	SI,CS:[TEMPDPT]
	XOR	AX,AX
	MOV	ES,AX				; HAVE ES -> SEGMENT 0
	MOV	WORD PTR ES:[DSKADR],SI
	MOV	WORD PTR ES:[DSKADR+2],DS
GOTCURRENTDPT:
	RESTOREREG <ES,DS,SI>
DONTRESTORE:
	POP	AX
	CLC				; CLEAR CARRY
	RET

;******************************************************************************
;AN000;  Get Media ID
;*******************************************************************************
;									       *
; Function: Get the volume label, the system id and the serial number from     *
;	    the media that has the extended boot record.		       *
;	    For the conventional media, this routine will return "Unknown      *
;	    media type" error to DOS.                                          *
;									       *
; Input :   DS:DI -> BDS table for this drive.				       *
;	    ES:BX -> Request packet (= A_Media_ID_INFO structure)	       *
;									       *
; Output:   The request packet filled with the information, if not carry.      *
;	    If carry set, then AL contains the device driver error number      *
;	    that will be returned to DOS.				       *
;	    Register DS,DX,AX,CX,DI,SI destroyed.			       *
; Subroutines to be called:						       *
;	BOOT_IO:NEAR							       *
;									       *
; Logic:								       *
;	/*To recognize the extended boot record, this logic will actually  */  *
;	/*access the boot sector even if it is a hard disk.		    */ *
;	/*NOTE:the valid extended bpb is recognized by looking at the mediabyte*
;	/*field of BPB and the extended Boot Signature. 		       *
;									       *
; {									       *
;	Get logical drive number from BDS table;			       *
;	RFLAG = Read operation; 					       *
;	BOOT_IO;		 /*Get the media boot record into the buffer*/ *
;	IF (no error) THEN						       *
;	     IF (extended boot record) THEN				       *
;		{ set Volume Label, Volume Serial number and System id	       *
;		  of the Request packet to those of the boot record;	       *
;		};							       *
;	     ELSE		  /*Not an extended BPB */		       *
;		{ set Register AL to "Unknown media.." error code;	       *
;		  set Carry bit;					       *
;		};							       *
;	ELSE								       *
;	     Exit;		 /*Already error code is set in the register AL*
;									       *
; Expected LOC: 40 (New)						       *
;*******************************************************************************

GetMediaID	proc	near			;AN000;
	call	Changeline_Chk			;AN010;
	mov	al, DS:[DI].DRIVELET		;AN000; logical drive number
	mov	cs:RFlag, ROMREAD		;AN000; read operation
	call	Boot_IO 			;AN000; read boot sector into cs:DiskSector
;	$IF	NC				;AN000;
	JC $IOCTL$IF1
	   mov	   cl, cs:MediaByte		;AN000; Mediabyte in BPB
	   and	   cl, 0F0h			;AN000;
	   cmp	   cl, 0F0h			;AN000; Is it a valid BPB?
;	   $IF	   E,AND			;AN000;
	   JNE $IOCTL$IF2
	      cmp   cs:Ext_Boot_Sig, EXT_BOOT_SIGNATURE ;AN000; =90h
;	   $IF	   E				;AN000; Extended Boot Record
	   JNE $IOCTL$IF2
	      push cs				;AN000;
	      pop  ds				;AN000;
	      mov  si, offset Boot_Serial_L	;AN000;
	      mov  di, bx			;AN000;
	      add  di, MI_SERIAL		;AN000;
	      mov  cx, BOOT_SERIAL_SIZE+BOOT_VOLUME_LABEL_SIZE+BOOT_SYSTEM_ID_SIZE
	      rep  movsb			;AN000;
;	   $ELSE				;AN000;
	   JMP SHORT $IOCTL$EN2
$IOCTL$IF2:
	      mov   al, ERROR_UNKNOWN_MEDIA	;AN000; =7
	      stc				;AN000;
;	   $ENDIF	;End Extended Boot Record check.
$IOCTL$EN2:
;	$ENDIF	;Read boot sector failed. Hard error.
$IOCTL$IF1:
	ret					;AN000;
GetMediaID	endp

;******************************************************************************
;AN000;  Set Media ID
;*******************************************************************************
;									       *
; Function: Set the volume label, the system id and the serial number of       *
;	    the media that has the extended boot record.		       *
;	    For the conventional media, this routine will return "Unknown      *
;	    media.." error to DOS.                                             *
;	    This routine will also set the corresponding informations in       *
;	    the BDS table.						       *
;									       *
; Input :   DS:DI -> BDS table for this drive.				       *
;	    ES:BX -> Request packet (= A_Media_ID_INFO structure)	       *
;									       *
; Output:   The extended boot record in the media will be set according to     *
;	    the Request packet. 					       *
;	    If carry set, then AL contains the device driver error number      *
;	    that will be returned to DOS.				       *
;									       *
; Subroutines to be called:						       *
;	BOOT_IO:NEAR							       *
;									       *
; Logic:								       *
;									       *
;									       *
; {									       *
;	Get Drive_Number from BDS;					       *
;	RFLAG = "Read operation";					       *
;	BOOT_IO;							       *
;	IF (no error) THEN						       *
;	     IF (extended boot record) THEN				       *
;		{ set Volume Label, Volume Serial number and System id	       *
;		  of the boot record to those of the Request packet;	       *
;		  RFLAG = "Write operation";				       *
;		  Get Drive Number from BDS;				       *
;		  BOOT_IO;	  /*Write it back*/			       *
;		};							       *
;	     ELSE		  /*Not an extended BPB */		       *
;		{ set Register AL to "Unknown media.." error code;	       *
;		  set Carry bit;					       *
;		  Exit; 	 /*Return back to caller */		       *
;		};							       *
;	ELSE								       *
;	     Exit;		 /*Already error code is set */ 	       *
;									       *
; Expected LOC: 45 (New)						       *
;*******************************************************************************

SetMediaID	proc	near
	call	Changeline_Chk			;AN010;
	mov	al, DS:[DI].DRIVELET		;AN000; logical drive number
	mov	dl, al				;AN000; save it for the time being.
	mov	cs:RFlag, ROMREAD		;AN000; read operation
	push	dx				;AN000; save drive number
	call	Boot_IO 			;AN000; read boot sector into cs:DiskSector
	pop	dx				;AN000; restore drive number
;	$IF	NC				;AN000;
	JC $IOCTL$IF6
	   mov	   cl, cs:MediaByte		;AN000; Mediabyte in BPB
	   and	   cl, 0F0h			;AN000;
	   cmp	   cl, 0F0h			;AN000; Is it a valid BPB?
;	   $IF	   E,AND			;AN000;
	   JNE $IOCTL$IF7
	      cmp   cs:Ext_Boot_Sig, EXT_BOOT_SIGNATURE ;AN000; =41 (=29h)
;	   $IF	   E				;AN000; Extended Boot Record
	   JNE $IOCTL$IF7
	      push ds				;AN011; save BDS pointer
	      push di				;AN011;
	      push es				;AN000;
	      pop  ds				;AN000;Now DS-> Request packet
	      push cs				;AN000;
	      pop  es				;AN000;Now ES -> Boot Record
	      mov  di, offset Boot_Serial_L	;AN000;
	      mov  si, bx			;AN000;
	      add  si, MI_Serial		;AN000;
	      mov  cx, BOOT_SERIAL_SIZE+BOOT_VOLUME_LABEL_SIZE+BOOT_SYSTEM_ID_SIZE
	      rep  movsb			;AN000;
	      pop  di				;AN011;Restore BDS pointer
	      pop  ds				;AN011;
	      call Mov_Media_IDs		;AN011; Update the BDS media ID info.
	      mov  al, dl			;AN000; set drive number for Boot_IO
	      mov  cs:RFlag, ROMWRITE		;AN000;
	      call Boot_IO			;AN000; write it back.
	      mov     cs:[TIM_DRV], -1		;AN011; Make sure chk$media check the driver
;	   $ELSE				;AN000;
	   JMP SHORT $IOCTL$EN7
$IOCTL$IF7:
	      mov   al, ERROR_UNKNOWN_MEDIA	;AN000; =7
	      stc				;AN000;
;	   $ENDIF	;End Extended Boot Record check.
$IOCTL$EN7:
;	$ENDIF	;Read boot sector failed. Hard error.
$IOCTL$IF6:
	ret					;AN000;
SetMediaID	endp

;******************************************************************************
;AN000;  Boot_IO
;*******************************************************************************
;									       *
; Function: Read/Write the boot record into Boot sector.		       *
;									       *
; Input :								       *
;	    AL=logical drive number					       *
;	    RFLAG = operation (read/write)				       *
;									       *
; Output:   For read operation, the boot record of the drive specified in BDS  *
;	    be read into the DISKSECTOR buffer. 			       *
;	    For write operation, the DISKSECTOR buffer image will be written   *
;	    to the drive specified in BDS.				       *
;	    If carry set, then AL contains the device driver error number      *
;	    that will be returned to DOS.				       *
;	    AX,CX,DX register destroyed.				       *
;	    If carry set, then AL will contain the error code from DISKIO.     *
;									       *
; Subroutines to be called:						       *
;	DISKIO:NEAR							       *
;									       *
; Logic:								       *
;									       *
; {									       *
;	First_Sector = 0;	 /*logical sector 0 is the boot sector */      *
;	SectorCount = 1;	 /*read 1 sector only */		       *
;	Buffer = DISKSECTOR;	 /*read it into the disksector buffer */       *
;	Call DISKIO (RFLAG, Drive_Number,First_Sector,SectorCount,Buffer);     *
; }									       *
; Expected LOC: 6 (New) 						       *
;*******************************************************************************
Boot_IO 	proc	near			;AN000;
	push	ds				;AN000;
	push	es				;AN000;
	push	di				;AN000;
	push	bx				;AN000;
;SB34IOCTL003**************************************************************
;SB	Call DISKIO to read/write the boot sector. The parameters which
;SB	need to be initialised for this subroutine out here are
;SB		- transfer address to cs:DiskSector
;SB		- low sector needs to be initalised to 0. This is a reg. param
;SB		- hi sector in cs:[Start_Sec_H] needs to be initialised to 0.
;SB		- number of sectors <-- 1
;SB	7 LOCS

	mov	di, cs
	mov	ds, di
	mov	es, di
	mov	di, offset DiskSector	;es:di -> transfer address
	xor	dx, dx			;first sector (H) -> 0
	mov	[Start_Sec_H], dx	;start sector (H) -> 0
	mov	cx, 01			;one sector
	call	DISKIO
;SB34IOCTL003**************************************************************
	pop	bx				;AN000;
	pop	di				;AN000;
	pop	es				;AN000;
	pop	ds				;AN000;
	ret					;AN000;
Boot_IO 	endp				;AN000;

;*******************************************************************************
;AN010;  Changeline_Chk
;*******************************************************************************
;When the user calls Get/Set media ID call before DOS establishes the media    *
;by calling "Media$Chk", the change line activity of the drive is going to be  *
;lost.	This routine will check the change line activity and will save the     *
;history in the flags.							       *
;									       *
; Function: Check the change line error activity			       *
;									       *
; Input :  DS:DI -> BDS table.						       *
;									       *
; Output:   FLAG in BDS table will be updated if change line occurs.	       *
;									       *
; Subroutines to be called:						       *
;	SET_CHANGED_DL							       *
;									       *
;*******************************************************************************
Changeline_Chk	proc	near			;AN010;
	mov	dl, byte ptr ds:[di].DRIVENUM	;AN010;
	or	dl, dl				;AN010;Fixed disk?
	js	Chln_Chk_Ret			;AN010;Yes, skip it.
	cmp	cs:[fHave96], 1 		;AN011;This ROM support change line?
	jne	Chln_Chk_Ret			;AN011;
	call	HasChange			;AN011;This drive support change line?
	jz	Chln_Chk_Ret			;AN011;do nothing
;SB34IOCTL004*****************************************************************
;SB	Execute the ROM disk interrupt to check changeline activity. 2 LOCS

	mov	ah, 16h
	int	13h
;SB34IOCTL004*****************************************************************
	jnc	Chln_Chk_Ret			;AN010;no change line activity?
	mov	word ptr cs:[FLAGBITS], FCHANGED ;AN010;
	call	SET_CHANGED_DL			;AN010;Update FLAG in BDS for this physical drive
Chln_Chk_Ret:					;AN010;
	ret					;AN010;
Changeline_Chk	endp				;AN010;

;******************************************************************************
;AN007;  GetAccessFlag
;*******************************************************************************
;									       *
; Function: Get the status of UNFORMATTED_MEDIA bit of FLAGS in BDS table      *
;									       *
; Input :								       *
;	    es:bx -> A_DISKACCESS_CONTROL structure			       *
;	    ds:di -> BDS table						       *
;									       *
; Output:   A_DISKACCESS_CONTROL.DAC_ACCESS_FLAG = 0 if disk I/O not allowed.  *
;						 = 1 if disk I/O allowed.      *
;*******************************************************************************
GetAccessFlag	proc					    ;AN007;
	test	word ptr ds:[di].FLAGS, UNFORMATTED_MEDIA   ;AN007;Is it unformtted media?
	jz	GAF_Allowed				    ;AN007;No, formatted media
	mov	es:[bx].DAC_ACCESS_FLAG, 0		    ;AN007;
	jmp	short GAF_Done				    ;AN007;
GAF_Allowed:						    ;AN007;
	mov	es:[bx].DAC_ACCESS_FLAG, 1		    ;AN007;
GAF_Done:						    ;AN007;
	ret						    ;AN007;
GetAccessFlag	endp					    ;AN007;

;******************************************************************************
;AN007;  SetAccessFlag
;*******************************************************************************
;									       *
; Function: Set/Reset the UNFORMATTED_MEDIA bit of FLAGS in BDS table	       *
;									       *
; Input :								       *
;	    es:bx -> A_DISKACCESS_CONTROL structure			       *
;	    ds:di -> BDS table						       *
;									       *
; Output:   UNFORMTTED_MEDIA bit modified according to the user request        *
;*******************************************************************************
SetAccessFlag	proc					    ;AN007;
	cmp	es:[bx].DAC_ACCESS_FLAG, 0		    ;AN007;
	jne	SAF_Allow_Access			    ;AN007;
	or	word ptr ds:[di].FLAGS, UNFORMATTED_MEDIA   ;AN007;
	jmp	short SAF_Done				    ;AN007;
SAF_Allow_Access:					    ;AN007;
	and	word ptr ds:[di].FLAGS, not UNFORMATTED_MEDIA ;AN007;
SAF_Done:						    ;AN007;
	ret						    ;AN007;
SetAccessFlag	endp					    ;AN007;